US 12,474,253 B2
Corrosive environment monitoring system and corrosive environment monitoring method
Rintarou Minamitani, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Appl. No. 18/028,769
Filed by Hitachi, Ltd., Tokyo (JP)
PCT Filed Sep. 8, 2021, PCT No. PCT/JP2021/033009
§ 371(c)(1), (2) Date Mar. 28, 2023,
PCT Pub. No. WO2022/091590, PCT Pub. Date May 5, 2022.
Claims priority of application No. 2020-179987 (JP), filed on Oct. 27, 2020.
Prior Publication US 2023/0333003 A1, Oct. 19, 2023
Int. Cl. G01N 17/04 (2006.01); G01N 27/20 (2006.01)
CPC G01N 17/04 (2013.01) [G01N 27/20 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A corrosive environment monitoring system comprising:
a corrosive environment monitoring sensor that includes a laminate including an insulating plate, a base metal thin film formed on the insulating plate, and a sensing metal thin film formed in at least a partial region of the base metal thin film and formed of a metal that is more easily corroded by a corrosive substance compared to the base metal thin film and has a lower resistance value than the base metal thin film, and a housing that encloses the laminate, has an opening in a side surface direction, and has a gas passage for the corrosive substance inside;
a resistance value measurement unit that detects an electric resistance between two points on the base metal thin film of the corrosive environment monitoring sensor; and
a determination unit that determines a type of the corrosive substance based on a change in electric resistance measured by the resistance value measurement unit over time,
wherein the determination unit determines the type of the corrosive substance by comparing a calculated value obtained by multiplying an incubation period in which the electric resistance hardly changes and a slope of a change in electric resistance per unit time after a lapse of the incubation period, with a preset threshold.